BREVIS is formulated as a soluble granule (SG) and its thinning ability is due to the active ingredient metamitron (15%). The other component is calcium, a key nutrient for pome fruits particularly in early development stages. The active ingredient disrupts the photosynthetic apparatus for 7 to 10 days after application, reducing electron transport rates by up to 60%. During this stress period fewer carbohydrates are produced, leading to an earlier and increased natural fruit drop. Thinning levels are concentration-dependent and can be enhanced under specific conditions (strong growing trees, varietal differences, cloudy weather and high night temperatures). High rates of BREVIS can in some cases lead to apparent leaf damage albeit without any effects on yield or quality. Due to the special formulation of the two compounds the risk of phytotoxicity is minimal.
What do I get as a grower?
- Optimal marketable fruit number, caliber, coloring and sugar content
- Consistent performance on all cultivated varieties, including hard-to-thin cultivars
- Reduce labor costs of hand thinning by up to 50 -80%
- Higher % marketable fruits and lower costs of picking, grading and storing
- High efficacy under different weather conditions
- No impact on plant hormone balance and no residues on harvested fruit
- Wider and flexible window of application with the option of a second spray
- Excellent toxicological profile with short re-entry time and no major label restrictions
- Safe on beneficial organisms, excellent fit in IPM programs
- Special SG formulation containing Calcium; a key nutrient for pome fruits
- Foliar uptake within 2 hours after application
As in most years fruit set exceeds target crop load, thinning becomes an essential cultivation measure for fruit growers in order to maintain a consistent annual production of high quality and optimal sized fruits. Fruit thinning can be carried out at 4 different stages: during flowering (1); on young fruitlets after fruit set (2); shortly after natural fruit fall in June (3); on diseased and misshapen fruits before harvest (4).
(1) Flower thinning: For reducing fruit set at an early stage and enhancing flower bud formation on the following year. It can be achieved both chemically and mechanically. Ammonium thiosulphate (ATS), ethrel and naphthaleneacetic acid (NAAm) are the most common chemical thinners. In fruit growing areas where early frost is a risk growers are often reluctant to resort to flower thinning.
(2) Fruit thinning: For thinning young fruits at the 6-16 mm stages. After Europe banned the widely used chemical thinner Carbaryl, it was replaced by the hormones 6-benzyladenine (BA) and naphtyl acetic acid (NAA). Under field conditions, the performance of BA is inconsistent across varieties (i.e. Red Delicious) and weather-dependent (T>18°C). NAA in turn can increase the number of undesirable small fruits (<65 mm; pygmee fruits). Back in 1990 metamitron (BREVIS) was first described as a most safe and promising photosynthesis inhibitor. The product is effective on all varieties from 8 to 16 mm fruitlet stage and the least temperature-dependent at the time of applicatioFruit thinning: For thinning young fruits at the 6-16 mm stages. After Europe banned the widely used chemical thinner Carbaryl, it was replaced by the hormones 6-benzyladenine (BA) and naphtyl acetic acid (NAA). Under field conditions, the performance of BA is inconsistent across varieties (i.e. Red Delicious) and weather-dependent (T>18°C). NAA in turn can increase the number of undesirable small fruits (<65 mm; pygmee fruits). Back in 1990 the photosynthesis inhibitor, metamitron (BREVIS) was first described as safe and promising fruitthinner. The product is effective on all varieties from 8 to 16 mm fruitlet stage and the least temperature-dependent at the time of application.
(3) Hand thinning: Commonly performed shortly after natural fruit fall from the 20 mm stage and beyond. Hand thinning is time consuming and expensive: it can increase production costs up to 2000 €/ha. Chemical thinning can significantly reduce labor costs of hand thinning, increase % marketable fruits and profit for the grower.
(4) Quality thinning: To improve quality in the weeks before harvest and to save on picking costs. Removing misshaped and infected fruits at this stage however, can add up to 40 hours/ha.
- Replace flower thinning activities and thus reduce the risks of early frost
- Reduce labor costs of hand thinning by up to 50 -80%
- Early fruit thinning brings extra fruit size and enhances bud formation
- Higher % marketable fruits and lower costs of picking, grading and storing.
How does BREVIS perform in comparison to market standards?
In more than 500 trials and with the support of the most experienced fruit thinning experts all over the world BREVIS consistently demonstrated to be more effective than the best commercial standards. Its temperature independency during application and the option of a 2nd treatment demonstrates the flexibility of BREVIS.
When and where will BREVIS be registered?
In 2014 the first official registration of BREVIS were granted in Israel and Italy. For the main fruit growing countries in Europe including Turkey, registration was granted. Additional international registrations were granted in South Africa, Chile and New Zealand and pending in China, Japan, US, Canada, Argentina, Brazil and Australia.
Can BREVIS be applied locally?
BREVIS has a local systemic activity and is not transported in the plant. For an optimal effect the product has to be applied on the part of the tree where the thinning is needed. In most cases this is the whole tree but in some varieties, extra thinning in the upper part of the tree can be needed. In this situation, a 2nd treatment of only the upper part of the tree can be considered.
Why does ADAMA prefer a rate in kg/ha?
BREVIS has very clear dose – response curve. Too high rates per hectare can lead to overthinning. As water volumes per ha can be different per country a maximum rate in kg per hectare on the label is more safe. The grower can decide how much water he wants to use based local conditions and spray quality.
In how much water does BREVIS need to be applied?
In most of the trials BREVIS was applied in 1000 to 1500 L/ha. Water is only the carrier of the product and depending of the spraying quality growers can adapt the water volume. Good results have been obtained with lower water volumes. Important to have an optimal coverage. Anti drift nozzles can be used.
Can I use BREVIS in mixtures ?
As we have not enough experience, mixtures with BREVIS are not recommended. ADAMA is working on country level in marketing trials on a list of potential mixing partners. Oily formulations and some additives to improve the uptake should never be used in combination with BREVIS.
How fast does BREVIS degrade in water?
Degradation of metamitron -expressed in DT50- depends of the temperature of the water and the pH. DT50 of BREVIS at 20°C at pH 4 is 353.2 days and 8.5 days at pH 9. In practical conditions the product degradation is not relevant. If for what reason the application must be postponed with a few days, this should not have an impact on the results.
BREVIS can be used on apples and pears from the 8 mm stage (diameter of the central “King” fruit) and up to the 16 mm stage. Application rates in the different countries were BREVIS is registered range from 1.1 to 2.2 kg/ha; with a maximum of 2 applications per season; an interval of 5-10 days between applications; a maximum total dose of 4.4 Kg/ha and a pre harvest interval (PHI) of 60 days. BREVIS has to be applied in a water volume up to 1500 L/ha.